I have attended several of these where the Medium brings forth someone that has died to give a message to one of the attendes.. I think It's all Bunk. There is no religious connotations.
Deuteronomy 18.
10 There shall not be found among you
anyone who makes his son or his daughter pass[
a] through the fire,
or one who practices witchcraft,
or a soothsayer, or one who interprets omens, or a sorcerer, 11 or one who conjures spells, or a medium, or a spiritist, or one who calls up the dead. 12 For all who do these things
are [
b]an abomination to the Lord, and because of these abominations the Lord your God drives them out from before you.
I would repent of even attending a seance..